Clear selection when IME input starts

include/ghostty.h

@@ -748,6 +748,7 @@ void ghostty_surface_complete_clipboard_request(ghostty_surface_t,
                                                 bool);
 bool ghostty_surface_has_selection(ghostty_surface_t);
 uintptr_t ghostty_surface_selection(ghostty_surface_t, char*, uintptr_t);
+void ghostty_surface_clear_selection(ghostty_surface_t);
 
 #ifdef __APPLE__
 void ghostty_surface_set_display_id(ghostty_surface_t, uint32_t);

macos/Sources/Ghostty/SurfaceView_AppKit.swift

@@ -1293,6 +1293,11 @@ extension Ghostty.SurfaceView: NSTextInputClient {
     }
 
     func setMarkedText(_ string: Any, selectedRange: NSRange, replacementRange: NSRange) {
+        // Clear selection when IME input starts
+        if let surface = self.surface, ghostty_surface_has_selection(surface) {
+            ghostty_surface_clear_selection(surface)
+        }
+
         switch string {
         case let v as NSAttributedString:
             self.markedText = NSMutableAttributedString(attributedString: v)

src/apprt/embedded.zig

@@ -1550,6 +1550,11 @@ pub const CAPI = struct {
         return selection.len;
     }
 
+    /// Clear the current selection in the surface.
+    export fn ghostty_surface_clear_selection(surface: *Surface) void {
+        surface.core_surface.io.terminal.screen.clearSelection();
+    }
+
     /// Tell the surface that it needs to schedule a render
     export fn ghostty_surface_refresh(surface: *Surface) void {
         surface.refresh();